Structure of the Λ(1405) baryon resonance from its large Nc behavior

被引:41
作者
Hyodo, Tetsuo [1 ,2 ]
Jido, Daisuke [2 ]
Roca, Luis [2 ,3 ]
机构
[1] Tech Univ Munich, Dept Phys, D-85747 Garching, Germany
[2] Kyoto Univ, Yukawa Inst Theoret Phys, Kyoto 6068502, Japan
[3] Univ Murcia, Dept Fis, E-30071 Murcia, Spain
来源
PHYSICAL REVIEW D | 2008年 / 77卷 / 05期
关键词
D O I
10.1103/PhysRevD.77.056010
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We study the behavior with the number of colors (N-c) of the two poles associated to the Lambda(1405) resonance obtained dynamically within the chiral unitary approach. The leading order chiral mesonbaryon interaction manifests a nontrivial N-c dependence for SU(3) baryons, which gives a finite attractive interaction in some channels in the large N-c limit. As a consequence, the SU(3) singlet ((K) over barN) component of the Lambda(1405) survives in the large N-c limit as a bound state, while the other components dissolve into the continuum. The N-c dependence of the decay widths shows different behavior from the general counting rule for a qqq state, indicating the dynamical origin of the two poles for the Lambda(1405) resonance.
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页数:5
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